Definitions for "Touchback"
Keywords:  punt, yard, football, kick, touchdown
The act of touching the football down by a player behind his own goal line when it received its last impulse from an opponent; -- distinguished from safety touchdown.
The ball is put down by a player behind his own goal line when the ball has been put across the goal line by an opponent. Can happen for instance in kick offs, when the kick lands in the end zone and the player returning the kick has no chance to exit the end zone. Does not count as a safety. Takalaiton (Pinomaa)
(American football) a play in which the opposing team has kicked the football into your end zone